Not necessarily, there are too many variables. The person in question may not own a radio. He may have spent a number of months in hospital because his wife got sick. An older person may have learned one of the facts over twenty years ago, and has since forgotten it. By random chance, one of the facts may have been heard by the candidate 10 minutes beforehand.

In short: it's a good indicator of so many random variables as to be simply an indicator of chaos itself. Don't use anything like this in any kind of test in which the results count - you will invariably get the short end of the stick with one or more candidates. Stick to measures that directly affect the job at hand, and culture fit.